Apparatus for electrically heating liquids



Aug. 4, 1925 A. D. POU

APPARATUS FOR ELECTRICALLY HEATING LIQUIDS Original Filed Oct. 20, 1923 Alfredo Domingo Pou,

abtozinoq Patented Aug. 4, 1925.

UNITED STATES 1,548,742 PATENT OFFICE.

ALFREDO DOMINGO PO'U, IBUENQS AIRES, ARGENTINA.

ABPARATUS FOB ELECTRICALLY HEATING LIQUIDS.

Original application filed October 20, 1923, Serial No. 669,782. Divided. and this application filed. December 9,1924. Serial No. 756L773."

electrically heating liquids, and more particularly to heaters of the type shown and described in my prior application, No.

669,782, filed October 20, 1923, of which the present case is a division.

According to the construction disclosed in that application, the liquid isinclu'ded in the heating circuit so that the current supplied to the electrodes passes into and through the liquid, and the electrodes themselves are of special character. In the present case, however, the heating is effected by means of resistance elements, the current passing through said elements and developing heat therein which is transmitted to the liquid by conduction. The elements which were utilized as electrodes in the construction first mentioned no longer serve that function but merely act as terminals for the resistances, through preserving the same form as before.

An embodiment of the invention is illustrated in the accompanying drawings, wherein Figure 1 is a vertical section of the improved heater;

Fig. 2 is a horizontal section showing a modified arrangement of the resistance terminals; and Y Fig. 3 is a detail view of a terminal.

As shown in Fig. 3 the terminal comprises a bar 1, on one end of which a small bar 2, forming the terminal proper, is screwed. For insulation purposes, the bar 1 is enveloped in a mica cover 3, and both elements are introduced into an externally threaded tube 4: on which a stuffing-box 5 is screwed against bar 2 so as to prevent the water in the boiler 13 from entering tube 4, the latter being firmly attached to the bar 1 by means of a throat-piece or collar 6. The outer end of bar 1 protrudes from tube a and has a portion 7 of square or like cross-section which allows the fixing thereon of a handle 16 in order to rotate the terminal and to introduce it more or less within the boiler.

The portion 8 of the bar immediately beyond the square portion 7 is threaded, and has connected to it, by means of nuts 9, the terminal of the corresponding electric cable 90. i i

i The; above-described terminal is introduced within. an internally threaded tube 10 provided at its inner end with a hinged cover 11 and closed at its outer end by a nut or collar 12. The tubes 10 are fixed to the boiler by means of supports 1a which maybe mounted either on the top and bottom walls thereof (Fig. 1) or on the'circumferential wall (Fig. 2), as may be preferred; and in the latter case, they may be arranged intwo or more parallel, horizontal planes, with the terminals in adjacent planes staggered. There may be three of the terminals in each set or group, as shown; or, if preferred, there may be six connected two-by two in parallel. The short bars 2 which form the terminals proper are interconnected at their tips by chrome-aluminum resistance wires, indicated at 19 in the case of the vertical top and bottom terminals (Fig. 1), and at 20 in the case of the horizontal terminals (Fig. 2). Tri-phase currents will be employed in the arrangement illustrated, and two of the terminals in any set will correspond to live poles, the third terminal being grounded; but where ordinary currents are utilized, there will be two terminals only in each set. In consequence, the supports 14 in which the tubes 10 are mounted may be equipped with sliding doors 15 in addition to the doors 11 hinged to said tubes, which doors 15 are closed when the parts 1-24- of any of the terminals are drawn outwardly to their furthest extent or are entirely removed incidental to changes in the arrangement or number of terminals to be used.

Revolving blades 21, 22 and 23 are used which, on rotating, agitate the liquid in the boiler so as to maintain a uniform temperature therein. These blades are fixed, respectively, to three vertical shafts 24, 25 and 26 which are here shown as nested, the inner shaft 24 being solid while the intermediate and outer shafts 25 and 26 are tubular. Said shafts may be rotated at any uniform or variable speed by suitable means such as the pulleys 27 secured to a horizontal driving shaft 28 which, by means of a bevel pinion 29, transmits movement to a similar gear 30 on the shaft 24c. Movement is transmitted from the said shaft 28 to the intermediate shaft 25 by a pinion 31 meshing with a crown gear 32, and to the outer shaft 26 by the intermeshing bevel pinion 33 and crown gear 34; the shaft 28 being mounted on the top wall of the boiler, and the gears 30, 32 and 34 secured to the upper ends of the corresponding agitator shafts. The lower ends of the tubular shafts 25 and 26 are provided with stufiing-boxes 35 and 36 to prevent entrance of Water thereinto.

I claim as my invention 1- 1. Apparatus for electrically heating liquids, comprising a receptacle; a plurality of sets of terminal members mounted in the Walls of said receptacle and projecting at their inner ends into the liquid in the interior thereof, the outer ends of said terminals adapted to be connected to current-conducting means; resistance wires connecting the inner ends of the terminals of each set so as to be submerged in the liquid and thereby directly heat the same; an agitator for the liquid disposed within said receptacle; and means for rotating the agitator.

2. Apparatus for electrically heating liquids, comprising a receptacle; a plurality of sets of terminal members mounted vertically in the top and bottom walls of said receptacle and projecting at their inner ends into the liquid in the interior thereof, the outer ends of said terminals adapted to be connected to current-conducting means; re sistance wires connecting the inner ends of the terminals of each set so as to be submerged in the liquid and thereby directly heat the same; an agitator for the liquid disposed within said receptacle; and means for rotating the agitator.

3. Apparatus for electrically heating liquids, comprising a receptacle; two sets of terminal members, one set mounted vertically in the top wall of the receptacle and the other set mounted vertically in the bottom wall, the outer ends of the terminals of each set adapted to be connected to ourrent-conducting means and the inner ends thereof projecting into the liquid in the interior of the receptacle; and resistance wires connecting together the said inner ends of the terminals of each set so as to be submerged in the liquid and thereby directly heat the same.

In testimony whereof I afiix my signature.

ALFREDO DOMINGO POU. 

